ElkBuffBars seems to support clicking off enchants on thrown weapons. Don't think it's what you're looking for, but maybe it'll help.
However, KBF, which is more like this addon in implementation suffers the same issues stemming from Blizzard code.
If I thought I would have the time, I'd try to find a solution as well. But gonn...

Dunno if you were interested in making this more automatic, so it shows things based on class. You could look at the code of oUF_DebuffHighlight to see an implementation. I was thinking of doing something like that standalone, but I've been too busy doing arenas lately.

Originally posted by Tense
This can easily be fixed. Open the xCT.lua file in the xct folder scroll down to line #1071 and replace it with this.
Original code:
xCT3:AddMessage(ACTION_PARTY_KILL..": "..tname, .2, 1, .2)
Replace with:
xCT3:AddMessage("Killing Blow", .2, 1, .2)
You could also just add a -- at the start of t...

If you're talking about debuffs on the player, then these cover that. If you're talking about timer bars like Classtimer et al, which rightly tend to cover more than target debuffs, there are a number of minimal addons that do this already including Filger and rFilter3.

Anchor and other settings are at the top of the lua file for editing. If you're not comfortable doing so, you're out of luck with this addon. As for someone updating a buff bar addon, the author hasn't had any activity on his account since December 15th, so I wouldn't say it's really being updated.

Just a couple snafus with the latest fix. In the table of horde races "Blood Elf" should be "BloodElf" and "Undead" should be "Scourge". And there is a debugging print call left in the raceCheck function : P

You may wanna check out Cairenn's response to a Custom Cursor guide on these forums. This information was received directly from Blizzard regarding MPQs, rather than Interface folder drop-ins.
http://www.wowinterface.com/forums/showpost.php?p=179719&postcount=41